Yes use a stern line if needed and you are proficient . This can be the only safe way. What else do want me to say ? I am only try to point out that the pressure can be a danger. You do not have to agree.
How good do you think this guy would have been with a stern line any better?
Asking for help or advice can be prudent. Maybe he did once and got the salt rubbed into him. He may have heard " Don't drive your boat like a car!"
Good day, Lou